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added some checks for trapezoid ordering

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Annika
2026-07-05 07:48:33 -07:00
parent 27a322d135
commit d2c76354e2
2 changed files with 48 additions and 15 deletions
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test
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test.cpp
+48 -15
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@@ -205,6 +205,24 @@ namespace UwU {
}
return;
}
// Draw a horizontally bounded trapezoid
// coords.y1 >= coords.y0
void pTrapezoid (Trapezoid coords, Color color) {
uint16_t height = 1 + coords.y1 - coords.y0;
int16_t LeftBound[height];
int16_t RightBound[height];
this->bresenham(coords.xl0, coords.y1 - coords.y0, coords.xl1, LeftBound);
this->bresenham(coords.xr0, coords.y1 - coords.y0, coords.xr1, RightBound);
for (uint16_t i = 0; i <= height; i++) {
for (uint16_t x = LeftBound[i]; x <= RightBound[i]; x++) {
this->putPixel((uint32_t)x, (uint32_t)i + coords.y0, color.r, color.g, color.b, color.a);
}
}
return;
}
public:
struct waymini* wm;
@@ -325,22 +343,37 @@ namespace UwU {
}
}
// Draw a horizontally bounded trapezoid
// coords.y1 >= coords.y0
// Draws a horizontally bounded trapezoid
void trapezoid (Trapezoid coords, Color color) {
uint16_t height = 1 + coords.y1 - coords.y0;
int16_t LeftBound[height];
int16_t RightBound[height];
this->bresenham(coords.xl0, coords.y1 - coords.y0, coords.xl1, LeftBound);
this->bresenham(coords.xr0, coords.y1 - coords.y0, coords.xr1, RightBound);
for (uint16_t i = 0; i <= height; i++) {
for (uint16_t x = LeftBound[i]; x <= RightBound[i]; x++) {
this->putPixel((uint32_t)x, (uint32_t)i + coords.y0, color.r, color.g, color.b, color.a);
}
UwU::Trapezoid saneCoords = coords;
if (coords.y0 > coords.y1) {
saneCoords.y0 = coords.y1;
saneCoords.y1 = coords.y0;
saneCoords.xl0 = coords.xl1;
saneCoords.xl1 = coords.xl0;
saneCoords.xr0 = coords.xr1;
saneCoords.xr1 = coords.xr0;
}
return;
uint16_t tempVal;
bool hflip0 = false;
if (saneCoords.xl0 > saneCoords.xr0) {
tempVal = saneCoords.xl0;
saneCoords.xl0 = saneCoords.xr0;
saneCoords.xr0 = tempVal;
hflip0 = true;
}
if (saneCoords.xl1 > saneCoords.xr1) {
if (!hflip0) {
// invalid geometry; emit console warning and don't attempt to draw
// possible options are: don't draw, lazy draw (incorrect geometry) -
// or split into two (way more work)
return;
}
tempVal = saneCoords.xl1;
saneCoords.xl1 = saneCoords.xr1;
saneCoords.xr1 = tempVal;
}
this->pTrapezoid(saneCoords, color);
}
};
}
@@ -363,7 +396,7 @@ int main(void) {
draw.rectangle(UwU::Coord2(69, 69), UwU::Coord2(420, 420), fuchsia);
draw.rectangleGradient(UwU::Coord2(200, 200), UwU::Coord2(600, 400), red, blue, alpha, red);
draw.trapezoid(UwU::Trapezoid(300, 400, 360, 360, 600, 401), green);
draw.trapezoid(UwU::Trapezoid(500, 400, 360, 360, 600, 401), green);
draw.point(UwU::Coord2(387, 43), green);